A man who lives in a homeless shelter is diagnosed with active tuberculosis (TB). The shelter keeps a list of those who are assigned beds, and the majority of those sleeping there are regulars
Which finding would indicate a positive tuberculin skin test result using a two-step process?
A) 4-mm induration
B) 2-mm induration
C) 6-mm induration
D) 3-mm induration
Ans: C
Feedback:
All high- and medium-priority contacts who do not have a documented previous positive tuberculin skin test result or previous TB disease should receive a baseline purified protein derivative (PPD) tuberculin skin test. The reaction to the intracutaneously injected PPD tuberculin skin test is the classic example of a delayed (cellular) hypersensitivity reaction, which induces induration. Induration of ??5 mm is considered a positive result in people who have an initial induration of 0 mm.
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